Find the exact value Do not use a calculator sec 45 degree s

Find the exact value. Do not use a calculator. sec 45 degree squareroot 3 2 squareroot 3/3 squareroot 2 squareroot 2/2 A point on the terminal side of angle theta is gives. (4, -3) Find sin theta. -3 4

Solution

1)sec45^o=2

2)y=-3, x =4

sin =y/(x²+y²)

sin=-3/(4²+(-3)²)

sin=-3/5